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QLite: Add OFFSET statement

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Marvin W 2018-07-12 20:27:50 +02:00
parent 0ceaaadb20
commit 063d0146f9
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GPG key ID: 072E9235DB996F2A
1 changed files with 9 additions and 2 deletions
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11
qlite/src/query_builder.vala
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@ -20,8 +20,9 @@ public class QueryBuilder : StatementBuilder {
// ORDER BY [...] // ORDER BY [...]
private OrderingTerm[]? order_by_terms = {}; private OrderingTerm[]? order_by_terms = {};
// LIMIT [...] // LIMIT [...] OFFSET [...]
private int limit_val; private int limit_val;
private int offset_val;
internal QueryBuilder(Database db) { internal QueryBuilder(Database db) {
base(db); base(db);
@ -103,6 +104,12 @@ public class QueryBuilder : StatementBuilder {
return this; return this;
} }
public QueryBuilder offset(int offset) {
if (this.limit_val == 0) error("limit required before offset");
this.offset_val = offset;
return this;
}
public QueryBuilder single() { public QueryBuilder single() {
this.single_result = true; this.single_result = true;
return limit(1); return limit(1);
@ -128,7 +135,7 @@ public class QueryBuilder : StatementBuilder {
} }
internal override Statement prepare() { internal override Statement prepare() {
Statement stmt = db.prepare(@"SELECT $column_selector $(table_name == null ? "" : @"FROM $((!) table_name)") WHERE $selection $(OrderingTerm.all_to_string(order_by_terms)) $(limit_val > 0 ? @" LIMIT $limit_val" : "")"); Statement stmt = db.prepare(@"SELECT $column_selector $(table_name == null ? "" : @"FROM $((!) table_name)") WHERE $selection $(OrderingTerm.all_to_string(order_by_terms)) $(limit_val > 0 ? @" LIMIT $limit_val OFFSET $offset_val" : "")");
for (int i = 0; i < selection_args.length; i++) { for (int i = 0; i < selection_args.length; i++) {
selection_args[i].bind(stmt, i+1); selection_args[i].bind(stmt, i+1);
} }